IUPAC:3',6'-dihydroxy-5-isothiocyanato-3H-spiro[2-benzofuran-1,9'-xanthen]-3-one; 3',6'-dihydroxy-6-isothiocyanato-3H-spiro[2-benzofuran-1,9'-xanthen]-3-one
IUPAC:3',6'-dihydroxy-5-isothiocyanato-3H-spiro[2-benzofuran-1,9'-xanthen]-3-one; 3',6'-dihydroxy-6-isothiocyanato-3H-spiro[2-benzofuran-1,9'-xanthen]-3-one